Entry 1 sense Webster, 1913 Trembling /trĕm'-bəl-ĭng/ · Trem·bling · IPA /ˈtɹɛmblɪŋ/ 01 a. Shaking; tottering; quivering. 1. Shaking; tottering; quivering. Phrases & compounds Trembling poplar — the aspen.