checkmate
verb /ˌtʃekˈmeɪt/,  /ˈtʃekmeɪt/
  /ˌtʃekˈmeɪt/,  /ˈtʃekmeɪt/
(also mate)
Verb Forms
| present simple I / you / we / they checkmate |    /ˌtʃekˈmeɪt/,  /ˈtʃekmeɪt/   /ˌtʃekˈmeɪt/,  /ˈtʃekmeɪt/  | 
| he / she / it checkmates |    /ˌtʃekˈmeɪts/,  /ˈtʃekmeɪts/   /ˌtʃekˈmeɪts/,  /ˈtʃekmeɪts/  | 
| past simple checkmated |    /ˌtʃekˈmeɪtɪd/,  /ˈtʃekmeɪtɪd/   /ˌtʃekˈmeɪtɪd/,  /ˈtʃekmeɪtɪd/  | 
| past participle checkmated |    /ˌtʃekˈmeɪtɪd/,  /ˈtʃekmeɪtɪd/   /ˌtʃekˈmeɪtɪd/,  /ˈtʃekmeɪtɪd/  | 
| -ing form checkmating |    /ˌtʃekˈmeɪtɪŋ/,  /ˈtʃekmeɪtɪŋ/   /ˌtʃekˈmeɪtɪŋ/,  /ˈtʃekmeɪtɪŋ/  | 
- checkmate somebody/something (in chess) to put your opponent in a position in which they cannot prevent their king (= the most important piece) being captured and therefore lose the game
- His king had been checkmated.
 
 - to defeat somebody completely
- She hoped the plan would checkmate her opponents.