pin down
To attach or secure with pins.
Pin down the tablecloth, so it doesn't blow away in the breeze.
ADJ
drawing, safety, tie | brass, bronze, diamond, metal, steel
VERB + PIN
drive in, stick in
She drove a pin into the wall to hang the picture frame.
remove
ADV
carefully
He carefully pinned the notice to the bulletin board so it wouldn't fall down.
firmly
back, on, together, up
She pinned her long curly hair up before going to the gym.
PREP
onto
She pinned the photograph onto her bedroom wall above her desk.
to
She pinned the notice to the bulletin board in the office hallway.
PHRASES
pin sth in place
ADV
helplessly
down
The wrestler managed to pin his opponent down for the final victory.
PREP
against
The wrestler forced his opponent against the mat during the match.
behind
She held the poster against the wall and pinned the corner behind the frame.
to
The wrestler pinned his opponent to the mat during the final round.
PHRASAL VERBS pin sth down
ADV
precisely
I couldn't precisely pin down what made her so upset yesterday.
VERB + PIN
be difficult to, be hard to