sit tight
to remain in a place, usually sitting down

[TahlilGaran] Dictionary of Contemporary English ▲

sit tight
[informal]
1.
to remain in a place, usually sitting down.
Just sit tight while I go and phone for help.

Sit tight and don't move that leg.

2.
to not take any action while you wait for something to happen.
Shareholders are advised to sit tight and see how the situation develops.

[TahlilGaran] English Idioms Dictionary ▲

sit tight
to wait patiently for something
"Please sit tight for a few minutes while I go and get a police officer."

[TahlilGaran] English Idioms Dictionary ▲

sit tight
v. phr., informal To make no move or change; stay where you are.
■ Often used as a command.
Sit tight; I'll be ready to go in a few minutes.
The doctor said to sit tight until he arrived.
The gangsters sat tight in the mountains while the police looked for them.
Compare: STAND PAT.

[TahlilGaran] English Idioms Dictionary ▲