blockyoudaoicibaDictYouDict[block 词源字典]
block: [14] English borrowed block from Old French bloc, but its ultimate origin appears to be Germanic; French acquired it from Middle Dutch blok ‘tree trunk’. The derived verb block ‘impede’ first crops up in the early 15th century, but was not established until the later 16th century; it originally meant ‘put blocks [of wood] or obstacles in the way of’. Blockade was coined in the 17th century, perhaps on the model of ambuscade, a contemporary synonym of ambush.
=> blockade[block etymology, block origin, 英语词源]
block (n.)youdaoicibaDictYouDict
"solid piece," c. 1300, from Old French bloc "log, block" of wood (13c.), via Middle Dutch bloc "trunk of a tree" or Old High German bloh, from a common Germanic source, from PIE *bhlugo-, from *bhelg- "a thick plank, beam" (see balk).

Meaning "mould for a hat" is from 1570s. Slang sense of "head" is from 1630s. Extended sense of "obstruction" is first recorded 1640s. In cricket from 1825; in U.S. football from 1912. The meaning in city block is 1796, from the notion of a "compact mass" of buildings; slang meaning "fashionable promenade" is 1869.
BLOCK. A term applied in America to a square mass of houses included between four streets. It is a very useful one. [Bartlett]
block (v.)youdaoicibaDictYouDict
"obstruct," 1590s, from French bloquer "to block, stop up," from Old French bloc (see block (n.)). Meaning "to make smooth or to give shape on a block" is from 1620s. Stage and theater sense is from 1961. Sense in cricket is from 1772; in U.S. football from 1889. Related: Blocked; blocking.