[] to write your name on a document, letter, etc. to show that you have written it, that you agree with what it says, or that it is genuine签（名）；签署◆Sign here, please.请在这里签名。◆Sign your name here, please.请在这里签名。◆You haven't signed the letter.那封信你还没有署名。◆to sign a deal/contract/cheque签署协议／合同／支票●ˌsigned and ˈsealed●ˈsigned, ˈsealed and deˈlivereddefinite, because all the legal documents have been signed铁定的；已成定局的●sign on the dotted ˈline () to sign a document to show that you have agreed to do sth or buy sth签名同意◆Always read the small print before you sign on the dotted line.签字之前一定要阅读小号字内容。●ˈsign for sthto sign a document to show that you have received sth签收◆Who signed for the package?是谁签收了那个包裹？●ˌsign ˈin/ˈout●ˌsign sb ˈin/ˈoutto write your name or the name of a guest when you arrive at or leave an office签到／退；替…签到／退◆All visitors must sign in on arrival.所有来访者必须签到。●ˌsign ˈoff●ˌsign sth ˈoffto end a letter, etc.结束写信◆I usually sign off an email with ‘regards’.我通常用“致意”一词结束电子邮件。●ˌsign sth ˈoffto give your formal approval to sth, by signing your name签字认可；签字赞同◆The accounts have not yet been signed off by the auditors.这些账目尚未经审计师签字认可。●ˌsign ˈoff on sth () () to express your approval of sth formally and definitely批准◆Investors have finally signed off on the deal.投资者最终同意了这笔交易。●ˌsign ˈon () () to sign a form stating that you are unemployed so that you can receive payment from the government办理失业登记（以领取失业救济金）●ˌsign ˈon/ˈup●ˌsign sb ˈon/ˈupto sign a form or contract which says that you agree to work for sb, do a deal, etc.; to persuade sb to sign a form or contract like this（使）签约受雇◆She signed on as a customer-support officer.她签约受雇为客服主管。◆We have signed on three major home builders as partners.我们已与三家大型住宅建筑商签约，与其合伙经营。●sign ˈout●ˌsign sb ˈout➡sign in/out; sign sb in/out ●ˌsign ˈup (for sth)●ˌsign sb ˈup (for sth)to arrange to receive or do sth报名参加◆Sign up for our monthly email newsletter.报名接收我们每月一期的电子邮件简讯。◆I've signed up for an accounting course.我报名参加了会计课程。◆Shall I sign you up for the workshop too?要我帮你也报名参加那个研讨会吗？