sign in

1. (idiomatic)To sign one's name on a list when entering a place, to indicate one's arrival.

   In order to get into the office after hours, you'll have to sign in at the security desk.

2. To take some action to access a secured program or web page on a computer; to log in.

1. Don't sign the contract in pencil.

   Не підписуй договір олівцем. — deniko

   ruНе подписывай контракт карандашом. — Ooneykcall

   deDen Vertrag nicht mit Bleistift unterschreiben! — Pfirsichbaeumchen

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2. I can't see the road signs in this fog.

   Мені не видно дорожніх знаків в цьому тумані. — ChickenKiev

   ruМне в этом тумане дорожных знаков не видно. — marafon

   deBei diesem Nebel kann ich die Straßenschilder nicht erkennen. — Serienchiller

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3. Most signs are written in English.

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4. Tom signed the contract in October.

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5. Please don't forget to sign in.

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irregular

• sign upзамовити, замовлятиTo add a name to the list of people who are participating in something.
• sign onпідписати, підписуватиTo join something, after signing.
• sign inзареєструватися, реєструватисяTo sign one's name on a list when entering a place, to indicate one's arrival.
• sign offTo log off; to stop using a computer, radio, etc.; especially, to stop talking.
• sign outTo sign one's name as an indication that one is leaving some location; to take some action to indicate one is leaving a secured program or web page on a computer.
• sign overTo transfer (property or rights) to somebody else by signing a document.
• sign awayTo give up something, such as a right or possession, by signing a document.