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find out
見い出す, 発見する, 知る, 正体を見破る
Phrasal Verb: find out
1. To ascertain (something), as through examination or inquiry:eg. I found out the phone number by looking it up. If you're not sure, find out.
2. To detect the true nature or character of; expose: eg. Liars risk being found out.
3. To detect and apprehend; catch: eg. Most embezzlers are found out in the end.