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on guard

ADJECTIVE
defensive
Synonyms
WEAK
alert averting cautious checking defending expectant guarding preservative preventive protecting safeguarding vigilant warding off watchful withstanding
ADVERB
feeling wary
Synonyms
WEAK
alert careful cautious defensive guarded heedful mindful observant on one's guard on one's toes on the lookout on the watch vigilant wary watchful

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.