sledgeyoudaoicibaDictYouDict[sledge 词源字典]
sledge: English has two words sledge. The sledge [OE] of sledgehammer [15] was once a word in its own right, meaning ‘heavy hammer’. It goes back to the prehistoric Germanic base *slakh- ‘hit’, source also of English slaughter, slay, etc. Sledge ‘snow vehicle’ [17] was borrowed from Middle Dutch sleedse. Like Dutch slee (source of English sleigh [18]) and Middle Low German sledde (source of English sled [14]), its ultimate ancestor was the prehistoric Germanic base *slid- ‘slide’ (source of English slide). Sledging ‘unsettling a batsman with taunts’ [20], which originated in Australia in the 1970s, may have been derived from sledgehammer.
=> slaughter, slay, sly; sled, sleigh, slide[sledge etymology, sledge origin, 英语词源]
unsettle (v.)youdaoicibaDictYouDict
1590s, "undo from a fixed position," from un- (2) "reverse, opposite of" + settle (v.). Of the mind, feelings, etc., attested from 1640s. Related: Unsettled; unsettling.