add-on
add-on

carry on
carry on with your work!

cling on
cling on to me!

come in on
come in on the race

come-on
come-on line

cotton on
to cotton on to something

dream on
dream on!

emphasis
...lay emphasis on / to place emphasis

goad on
to goad somebody on

hanger-on
parasita

hard-on
to have a hard-on

head-on
head-on collision

jam on
to jam on the brakes

jog on
jog on!

kid on
to kid somebody on

knock-on
to have a knock-on effect (on something)

lay on
everything will be laid on

let on
you won't let on, will you?

on
on a bicycle

pile on
to pile it on

roll on
roll on holidays!

roll-on
roll-on

sew on
to sew on a button

sneak on
to sneak on somebody

split on
to split on somebody

spur on
to spur somebody on

step on
to step on somebody's shoes

switch on
to switch on the light

take out on
to take it out on somebody