on alert
(transitive, obsolete) To debase or degrade.
A non-visual opsin present in some winged insects
on guard
A magic charm or spell. / Supernatural skill or luck. / (slang) Personal magnetism; charm. / (slang) Sex appeal; sex drive. / (slang) Illegal drugs.
その公園のレンジャーは、最近のオオカミの目撃があってから警戒していた。
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DiQt
Free
★★★★★★★★★★
