v. star·tled, star·tling, star·tles
1. To cause to make a quick involuntary movement or start.
2. To alarm, frighten, or surprise suddenly. See Synonyms at frighten.
To become alarmed, frightened, or surprised.
1. A sudden, brief episode of fear.
2. A sudden, involuntary movement in response to something frightening or unexpected, such as a noise.
[Middle English stertlen, to run about, from Old English steartlian, to kick; see ster-1 in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.