Phrasal verbs starting with I/J/K

Keep on

Continue doing something

Keep up with

Stay at the same level as someone or something

Kneel down

Go down on your knees

Kick off

Start

Knock back

Drink quickly (usually alcohol)

Knock down

Strike someone or something to the ground

Knock out

Cause someone to fall unconscious

Know of

Have knowledge about something

Impose on/upon

Ask too much of someone

Improve on/upon

Make better