1. Noun usage:
-Sign can refer to signs, signs or symbols. For example, there is a sign indicating the entrance to the park.
-Sign can also refer to gestures, especially nonverbal expressions conveyed by hand, body or voice. For example, she gave me a thumbs-up.
-Sign can also refer to signing a contract, document or agreement. Before we continue, I need you to sign this document.
2. Verb usage:
-Sign as a verb means signature, sign or mark. For example, he signed the contract without reading it carefully.
-Sign can also mean to send a signal or gesture to someone to convey information. She motioned him to stop talking.
-Sign can also indicate that something is about to happen. For example, dark clouds indicate that a storm is coming.
3. Idiom usage:
-End: means to end or stop. I want to stop working now and have a rest.
-Login: indicates login or registration. For example, please sign in at the front desk before entering the building.
-Registration: refers to registering or registering for an activity. For example, I decided to sign up for a photography class.