trem·ble 
/ˈtrɛmbəl/ verb
trem·bles; trem·bled; trem·bling /ˈtrɛmbəl/ verb [no obj] 1 : to shake slightly because you are afraid, nervous, excited, etc.
▪ His arms and legs began to tremble. ▪ My voice trembled as I began to speak. ▪ I opened the letter with trembling hands. — often + with ▪ She was trembling with fear/excitement. 2 : to shake slightly because of some force
▪ The house trembled as the big truck drove by. 3 somewhat formal : to be afraid or nervous
▪ I tremble to think of what could happen. = I tremble at the thought of what could happen.
▪ His arms and legs began to tremble. ▪ My voice trembled as I began to speak. ▪ I opened the letter with trembling hands. — often + with ▪ She was trembling with fear/excitement.
▪ The house trembled as the big truck drove by.
▪ I tremble to think of what could happen. = I tremble at the thought of what could happen.
— tremble noun, plural trembles [count] — usually singular ▪ I felt a tremble as the truck drove by. ▪ I could hear a tremble in her voice. — often + of ▪ He felt a tremble of nervousness.
