attack

1 attack /əˈtæk/ verb
attacks; attacked; attacking
1 attack
/əˈtæk/
verb
attacks; attacked; attacking
Britannica Dictionary definition of ATTACK
1 
: to act violently against (someone or something) : to try to hurt, injure, or destroy (something or someone)
[+ object]
— often used as (be) attacked
[no object]
2 
[+ object] : to criticize (someone or something) in a very harsh and severe way
3 
[+ object]
a  : to begin to work on or deal with (something, such as a problem) in a determined and eager way
b  : to begin to eat (food) eagerly
4 
[+ object] : to begin to harm, injure, or destroy (something)
5 
sports : to try to score points or goals by moving forward in a very forceful way
[no object]
[+ object]

— attacker

noun, plural attackers [count]
2 attack /əˈtæk/ noun
plural attacks
2 attack
/əˈtæk/
noun
plural attacks
Britannica Dictionary definition of ATTACK
1 
a  [count] : a violent, harmful, or destructive act against someone or something
— often + on
b  : harmful or destructive action against something by a disease, insect, chemical, etc.
[noncount]
[count]
2 
: an attempt by a military force to defeat an enemy : a military offensive
[count]
[noncount]
3 
[count] : strong or severe criticism
4 
[count] : a sudden short period of suffering from an illness or of being affected by a strong emotion — often + of
— sometimes used figuratively
— see also heart attack
5 
[count] : an attempt to destroy or end something — often + on
6 
: a method of dealing with something (such as a problem)
[count]
[noncount]
7 
sports
a  [count] : an attempt by a player or group of players to score points, goals, or runs — usually singular
b  British : the players on a team who try to score : offense
[singular]
[noncount]

on the attack

: making an attack

under attack

: being affected or hurt by an attack : being attacked
3 attack /əˈtæk/ adjective
3 attack
/əˈtæk/
adjective
Britannica Dictionary definition of ATTACK
always used before a noun
: designed for or used in a military attack