high sign

1. 1.

   a silent signal of warning or recognition

   “she started to speak but he gave her the high sign”

   Broadersignal

Questions about high sign

What does high sign mean?

high sign means "a silent signal of warning or recognition".

Is high sign a common word?

high sign is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.