to compel another arrangement

to be compelled

to compete head to head with someone

to compete for attention

competent authority

competent knowledge of English

Competition brings prices down

to compile statistics

complacency

complacency about something

to complain

Complaints came from all quarters

complete and utter bastard/fool/twat

complete mix-up

to be a complete flop

complete nincompoop

to be in a complete tizzy

We’ve completed your order

I am completely confused.

to be completely right

to be completely wrong

to be completely cracked

It’s a completely different ball game

a completely different ball game

completely rounded