At meal-time. — This should apparently be joined to what precedes: Boaz now shows a fresh act of kindness.
Vinegar. — By this term is to be understood wine which had become sour (Proverbs 10:26). As such, Nazarites were forbidden to use it (Numbers 6:3). Similar to this was the vinegar of the Gospel narrative, a sour wine generally mixed with water, which was offered to our Saviour (Matthew 27:48, &c.).
Left. — Had to spare. In Ruth 2:18, we find that this superfluity was put by for her mother-in-law.