We have no meanings for "momentary sign" in our records yet.
1 Eldon Parr's voice gave a momentary sign of breaking.
2 Chase showed a momentary sign of uneasiness, but covered it instantly by laughing with the others.
3 An instant's nervousness, a momentary sign of self-consciousness, would have broken the spell and set the room against him.
4 Both passed away like a summer cloud; and never but once afterwards did I witness on her part a momentary sign of anger.
5 She saw us, acknowledged us, but hurriedly, and not without some momentary signs of agitation.
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