The Hebrew word for hand is יד , while two hands are ידיים . These words work for “arm” and “arms” as well, for example:
הידיים שלו שזופות.
His arms are tan.
ידיים follows the tendency for body parts that come in pairs to have the יים – ending, which is reserved for things that come in twos. Not so the word that refers specifically to “arm”, which you may recognize from the Passover Seder: זרוע . Its plural form is זרועות – with the ות- ending.
For example:
קיבלו אותי בזרועות פתוחות.
(They) accepted me with open arms.
