Webster's Revised Unabridged Dictionary · 1913

Pains

Pains (pānz) , noun

Labor; toilsome effort; care or trouble taken; -- plural in form, but used with a singular or plural verb, commonly the former.
And all my pains is sorted to no proof. — Shakespeare
The pains they had taken was very great. — Clarendon
The labored earth your pains have sowed and tilled. — Dryden