Dic/ thesaurus/ overwhelm

1. If you are overwhelmed by a feeling or event, it affects you very strongly, and you do not know how to deal with it.

• He was overwhelmed by a longing for times past.
• The need to talk to someone, anyone, overwhelmed her. 

   a. To impair severely something such as the spirit, health, or effectiveness of: break, crush, destroy, ruin.
   / to overpower the thoughts, emotions, or sense of.

   b. To affect deeply or completely, as with emotion: crush, engulf, overcome, overpower, prostrate.
   / to weigh or rest upon overpoweringly


2. If a group of people overwhelm a place or another group, they gain complete control or victory over them.

• It was clear that one massive Allied offensive would overwhelm the weakened enemy.

   c. To affect as if by an outpouring of water: deluge, flood, inundate, swamp, whelm.
   / to overcome, as with a profusion or concentration of something

   d. To flow over completely: deluge, drown, engulf, flood, flush, inundate, overflow, submerge, whelm.
   / to cover over or bury completely

   e. To render totally ineffective by decisive defeat: annihilate, crush, drub, overpower, smash, steamroller, thrash, trounce, vanquish.
   / to overcome with irresistible force

...... COBUILD, Roget's II, Collins