enemy, revenge
讐 centers on a hostile relationship that demands retaliation: an enemy or the act of revenge.
讐 combines 雔 (a pair of birds, suggesting a matched pair or opposition) with 言 (words), likely expressing the idea of answering back or retaliating with words, which extended to enmity and revenge.
Two birds 雔 squawking at each other over words 言: a bitter argument that turns them into enemies seeking revenge.
For シュウ, imagine an enemy shouting 'shoo!' at the pair of birds, driving them away: shoo -> シュウ, and the enemy's revenge is to shoo them off.
revenge
Revenge of the Nerds (1984 film)
not wanting to live in the same world as one's father's or lord's enemies; being prepared to sacrifice one's life to avenge one's father or lord
desire for vengeance
revenge tragedy
desire for revenge; vengeful thoughts
return match
avenger; revenger
resentment; hatred; enmity
love and hate