/swɪtʃ ||; swɪtʃ/verb[I,T] 1 switch (sth) (over) (to sth);switch (between A and B) to change or be changed from one thing to another 转变；改变: I'm fed up with my glasses -- I'm thinking of switching over to contact lenses. 我眼镜戴腻了，正考虑改换隐形眼镜。Press these two keys to switch between documents on screen. 按这两个键可以在屏幕上从一个文件切换到另一个文件。The match has been switched from Saturday to Sunday. 比赛日期已从星期六改到星期日。
2 switch (sth) (with sb/sth);switch (sth) (over/round) to exchange positions, activities, etc 交换（位置、活动等）: This week you can have the car and I'll go on the bus, and next week we'll switch over. 这个星期你用车子，我坐公共汽车，下个星期我们对调。Someone switched the signs round and everyone went the wrong way. 有人把路标对调，结果大家都走错了路。
switch (sth) off/on to press a switch in order to start/stop electric power （用开关）接通／切断电流；打开／关掉:
Don't forget to switch off the cooker. 别忘记关掉炉子。 switch (sth) over to change to a different television programme 转换电视频道