3/ Intransitive
Example :
catch on = to understand
Correct: After I explained the math problem, she began to catch on.
Incorrect: She began to catch on the math problem. (catch on cannot take a direct object in this meaning.)
Correct: She began to catch on to the math problem. (the word "to" makes the math problem an indirect object, which is acceptable in this meaning.)
A list :
back down - retreat from a position in an argument
back out - desert; fail to keep a promise
back up - move backwards
bear up - endure
blow in - drop in to visit unexpectedly
blow over - pass without doing harm
blow up - explode; lose one's temper
call up - telephone
calm down - become calm
carry on - continue as before; misbehave
catch on - understand
catch up - cover the distance between oneself and a moving goal
check up - investigate
check out - leave; pay one's bill
cheer up - become cheerful
clear out - leave
clear up - become clear
close down - close permanently
close up - close temporarily
came about - happen
come along - accompany; make progress
come back - return
come by - visit someone in his home
come out - appear; make a social debut
come over - come to someone's house, to where someone is
come through - succeed
come to - regain consciousness
cut in - interrupt
die away - fade; diminish
die down - fade; diminish
die off/out - disappear; become extinct
dress up - don fancy or unusual clothes
drive back - return by car
drop in - visit someone casually without planning
drop out - abandon some organized activity; leave; quit
drop over - visit someone casually
fall behind - not progress at required pace
fall off - decrease; lose weight
fall through - fail; not be accomplished
fill in - substitute
find out - learn
fly back - return by air
fly over - fly to where someone is
get ahead - make progress
get along - have a friendly relationship
get around - circulate; move about
get away - escape
get by - manage; either just barely or with a minimum of effort
get in - enter
get off - descend from leave
get on - enter (a vehicle); mount (a horse, etc.)
get on/along - progress; be compatible
get up - rise
get through - finish
give out - become exhausted
give up - surrender; fail to finish
go back - return
go off - explode
go on - happen; continue
go out - stop burning; leave one's residence
go over - go; succeed
grow up - mature
hang around - remain idly; dawdle
hang up - replace a telephone receive on its hook
hold on - grasp tightly; persevere; wait while telephoning
hold out - continue to resist; persevere; persist
keep on - continue
keep up - maintain the required pace or standard; continue
let up - diminish in intensity
lie down - recline
look on - be a spectator
make out - progress; succeed
make up - become reconciled
move over - move to the side
pan out - turn out well; be successful
pass out - become unconscious
pass on - die
pick up - grow; increase
pull in - arrive
pull out - deport
pull through - survive (barely)
ride over - ride to where someone is
run away - escape; leave; leave quickly without permission
run down - slowly lose power so as to stop functioning
run off - depart running; drain
sell out - sell the ownership or responsibility
settle up - pay one's bills or debts
show off - boast by words or actions
show up - arrive; appear unexpectedly
shut up - stop talking
slow up - reduce speed
stand by - wait; be prepared to assist
stand up - stand; rise from sitting; last; endure
stay over - remain at someone's house overnight or longer
step aside - move to one side
take off - leave the ground
take over - assume command
talk back - answer impolitely
throw up - vomit
turn around - turn so that one is facing another direction
turn in - go to bed
turn out - succeed; come; appear, as at a public meeting
turn up - arrive; be found unexpectedly
wait up - remain awake in anticipation
wake up - awaken
walk back - return on foot to where one was
walk over - walk to where someone is
wash out - fade or disappear from washing
watch out - be careful
wear off - fade; disappear through use or time
wear out - become unusable through use; become used up
work out - be successful