This is an ironic term for people whom the speaker thought were friends but turned out to be enemies. Alternate translation: "my treacherous friends" or "my so-called friends" (See: [[rc://en/ta/man/jit/figs-irony]])
Jeremiah speaks of his enemies waiting for him to do something wrong for which they might accuse him as if they were watching for him to fall down. (See: [[rc://en/ta/man/jit/figs-metaphor]])