tie down
phrasal verbtie somebody down (to something/to doing something) 
- to limit somebody’s freedom, for example by making them accept particular conditions or by keeping them busy限制;束缚;牵制 - Kids tie you down, don't they?孩子们把你给拖累住了吧? 
- I don't want to tie myself down to coming back on a particular date.我不想限定自己在哪一天回来。 
 
- Kids tie you down, don't they?