(teeters, teetering, teetered)
1.
Teeter is used in expressions such as teeter on the brink and teeter on the edge to emphasize that something seems to be in a very unstable situation or position.
Three of the hotels are in receivership, and others are teetering on the brink of bankruptcy...
His voice teetered on the edge of hysteria.
VERB: V on n, V on n [emphasis]
2.
If someone or something teeters, they shake in an unsteady way, and seem to be about to lose their balance and fall over.
Hyde shifted his weight and felt himself teeter forward, beginning to overbalance...
VERB: V adv/prep