The unjustifiable retention of the possession of real property by one whose original entry was lawful, as when a tenant holds over after lease termination despite the landlord’s demand for possession. [Cases: Forcible Entry and Detainer 5.]
unlawful drilling 〈英〉非法操练 1819年《非法操练法》〔Unlawful Drilling Act〕被1920年《火器法》〔Firearms Act〕第16条所修正，规定凡参加旨在进行军事训练或被训练的会议均被认为是非法，除非这种会议是经过国王〔Crown〕或国务大臣〔Secretary of State〕或任何被其委任的官员所授权召开的。
unlawful sexual conduct with a minor. See IMPAIRING THE MORALS OF A MINOR.
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unlawful contract 非法合同 指其中包含非法行为的合同，例如规定当事人从事某种法律所禁止的行为，或规定当事人对法律的命令性规范不作为。它与无效合同〔void contract〕相区别，后者是指因不具有任何法律效力，从而不能被强制执行的合同。 (→illegal contract)
Picketing carried on in violation of law, as when the picketers use threats or violence to dissuade other employees from returning to work.
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unlawful entry (1)非法进入 不使用暴力，而是在未经授权的情况下，以欺骗或其他恶意方式进入他人土地。 (2) 非法闯入 夜盗罪的构成要件之一，是指行为人未经同意而闯入他人的住宅。