1) Almost fall 2) Balance on the brink 3) Balance precariously 4) Balance precipitously 5) Balance suspensefully 6) Balance unsteadily 7) Barely keep balanced 8) Be about to fall 9) Be about to topple 10) Be in a precarious state 11) Be in danger of falling 12) Be indecisive 13) Be on the brink 14) Be on the edge Found on https://www.crosswordclues.com/clue/teeter
• (v. i. & t.) To move up and down on the ends of a balanced plank, or the like, as children do for sport; to seesaw; to titter; to titter-totter. Found on http://thinkexist.com/dictionary/meaning/teeter/
Tee'ter intransitive verb & t. [ imperfect & past participle Teetered ; present participle & verbal noun Teetering .] [ Prov. English titter to tremble, to seesaw; confer Icelandic titra to tremble, Old High German zitta... Found on http://www.encyclo.co.uk/webster/T/19