BTŠvu 46a(44) :דעביד דאיכ׳ איניש דגזים ולא קטיל הכא נמי גזים ולא עביד‏ : a person is apt to threaten and not to cut down (the tree). In this case also he threatens and does not act
See the entire entry for gzm#2 vb. to threaten