knock someone's socks off
To impress greatly; amaze; stun.
You wouldn't expect teenagers to sing opera, but these kids will knock your socks off.
ADJ
loud, sharp | gentle, light | determined | timid
VERB + KNOCK
hear
answer
He ignored the knock on his office door and continued working.
PHRASES
a knock at/on the door
She heard a gentle knock on the door and went to answer it.
ADJ
hard, nasty, severe
She experienced some nasty knocks when starting her new business, but she persevered.
minor
VERB + KNOCK
get, have, take
The team's confidence took a real knock after losing their first three games.
give sb/sth
PREP
~ on
ADV
accidentally
She accidentally knocked over her coffee while reaching for the sugar.
about, aside, over
The vase fell and knocked the picture frame aside when it hit the shelf.
PREP
against
The ladder fell over and knocked against the fence during the storm.
off
The strong wind knocked several branches off the old oak tree in our garden.
on
She knocked her elbow on the sharp corner of the table.
PHRASES
knock sb/sth flying
The strong wind knocked the flowerpots flying across the patio this morning.
knock sb off their feet
When she saw her ex at the party, the surprise knocked her completely off her feet.
knock sb out/senseless/unconscious
One punch in the boxing match knocked the champion senseless.
knock sb to the ground
ADV
loudly | softly | politely, timidly
PREP
at
A visitor knocked at the window to get our attention.
on
He knocked on the window to get his friend's attention.
PHRASES
without knocking
She rushed into the bedroom without knocking and startled her brother.