stamp

1、stamp 和 step 是同一个"脚往下踩"的两副拼写（它鼻音化自表示踩踏的老根，同 step、stomp、stump）：带 m 的更重——stamp 跺脚、stomp 顿脚。
2、四个意思用一根线串：踩 → 捣碎碾平 → 压出印子 → 盖在纸上的印 → 邮票。stamp 最早的意思就是"捣碎、碾"，邮票(postage stamp)来自"加压印出花纹"那一层。
3、往上还有 stand 这一家(最终来自 PIE*sta「站立」，同 stand)：站、走、踩都在这条路上。动词过去式 stamped；搭配 stamp on 踩、a stamp of approval 批准章。

stamp 邮票，印章，印花，痕迹，烙印，跺脚，猛踩

来 自 中 古 英 语 stampen, 踩 踏 ， 捣 ， 来 自 古 英 语 stempan, 捣 ， 碾 碎 ， 来 自 Proto-Germanic*stampijana,踩踏，击打，来自 PIE*stemp,踩踏，践踏，鼻音化自 PIE*stebh, 踩踏，词源同 step,stomp,stump.最终来自 PIE*sta,站立，词源同 stand.引申诸相关词义。

stamp

stamp: [12] Stamp originally meant ‘crush into small pieces, pound’. The sense ‘slam the foot down’ did not emerge until the 14th century, and ‘imprint with a design by pressure’ (which forms the semantic basis of postage stamp [19]) is as recent as the 16th century. The word comes, probably via an unrecorded Old English *stampian, from prehistoric Germanic *stampōjan (source also of German stampfen, Dutch stampen, Swedish stampa, and Danish stampe).

This was derived from the noun *stampaz ‘pestle’, which was formed from the base *stamp- (a non-nasalized version of which, *stap-, lies behind English step). The Germanic verb was borrowed into Vulgar Latin as *stampīre, whose past participle has given English, via Mexican Spanish, stampede [19].
=> stampede, step

stamp (v.)

Old English stempan "to pound in a mortar," from Proto-Germanic *stamp- (cognates: Old Norse stappa, Danish stampe, Middle Dutch stampen, Old High German stampfon, German stampfen "to stamp with the foot, beat, pound," German Stampfe "pestle"), from nasalized form of PIE root *stebh- "to support, place firmly on" (cognates: Greek stembein "to trample, misuse;" see staff (n.)). The vowel altered in Middle English, perhaps by influence of Scandinavian forms.

Sense of "strike the foot forcibly downwards" is from mid-14c. The meaning "impress or mark (something) with a die" is first recorded 1550s. Italian stampa "stamp, impression," Spanish estampar "to stamp, print," French étamper (13c., Old French estamper) "to stamp, impress" are Germanic loan-words. Related: Stamped; stamping. To stamp out originally was "extinguish a fire by stamping on it;" attested from 1851 in the figurative sense. Stamping ground "one's particular territory" (1821) is from the notion of animals. A stamped addressed envelope (1873) was one you enclosed in a letter to speed or elicit a reply.

stamp (n.)

mid-15c., "instrument for crushing, stamping tool," from stamp (v.). Especially "instrument for making impressions" (1570s). Meaning "downward thrust or blow with the foot, act of stamping" is from 1580s. Sense of "official mark or imprint" (to certify that duty has been paid on what has been printed or written) dates from 1540s; transferred 1837 to designed, pre-printed adhesive labels issued by governments to serve the same purpose as impressed stamps. German Stempel "rubber stamp, brand, postmark" represents a diminutive form. Stamp-collecting is from 1862 (compare philately).

1. Last November the commission gave its stamp of approval to the deal.

去年11月，委员会核准了这宗交易。

2. It's FREEPOST, so there's no need for a stamp.

这是免费邮寄，不用贴邮票。

3. He says he'll have no problem authenticating the stamp.

他说自己可以对这枚邮票进行鉴定。

4. The stamp was a dull blue colour.

邮票是晦暗的深蓝色。

5. Parliament's job is to rubber-stamp his decisions.

国会的工作就是例行公事式地批准他作出的决定。