noun, noun or participle which takes 'suru'
sign in; log in
Common IT term for logging into a system or service. Used as a noun or with する.
アカウントにサインインしてください。
Please sign in to your account.
サインインに失敗しました。
Sign-in failed.
More common general term for logging in. サインイン is often used in specific service contexts (e.g., Microsoft, Google).
Opposite action: signing out or logging out.
Borrowed from English 'sign in'.