Hero and Ursula Trick Beatrice, Explained：double meaning

There's a double meaning in that.

Benedick takes Beatrice's ordinary dinner message and decides it secretly declares her love. He's inventing the subtext, which is exactly the joke.

Some Cupid kills with arrows, some with traps.

Hero's verdict on the trick: Cupid doesn't only strike with love at first sight. Sometimes people are caught by a scheme — and it works on Beatrice.

What fire is in mine ears?

Beatrice, alone, can't cool down what she's just heard. The 'fire' is the sting of being praised and criticized in the same breath, and it moves her toward love.

I will requite thee, taming my wild heart to thy loving hand.

She promises to return his love and gives up her independence — the wild heart is hers, and she hands the reins to Benedick.

Disdain and scorn ride sparkling in her eyes, misprising what they look on, and her wit values itself so highly, that to her, all matter else seems weak.

Ursula's description of Beatrice's greatest flaw: contempt in her eyes and a wit that rates itself above everything. It's the precise pride the trick exploits.

I took no more pains for those thanks than you take pains to thank me.

Beatrice's answer when thanked for coming: the effort she spent equals the effort he spent thanking her — barely any. A double-edged compliment turned into a small insult.