Charles Ellicott Commentary Ruth 2:14

"And at meal-time Boaz said unto her, Come hither, and eat of the bread, and dip thy morsel in the vinegar. And she sat beside the reapers, and they reached her parched grain, and she did eat, and was sufficed, and left thereof." — Ruth 2:14 (ASV)

At meal-time. —This should apparently be joined to what precedes: Boaz now shows a fresh act of kindness.

Vinegar. —This term refers to wine that 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 and other passages).

Left. —Meaning, she had some to spare. In Ruth 2:18, we find that this excess was set aside for her mother-in-law.