סְ֭בָבוּנִי פָּרִ֣ים רַבִּ֑ים אַבִּירֵ֖י בָשָׁ֣ן כִּתְּרֽוּנִי׃
Many bulls have encompassed me; strong bulls of Bashan have beset me round.
Radak on Psalms
Bulls have surrounded me: – This is the trouble that is near at hand, that bulls have compassed me – a figure for lusty and powerful and wicked enemies. The interpretation of (רבים is)
Rashi on Psalms
the mighty ones of Bashan That too is an expression of the bulls of Bashan, which are fat.