From Middle English birlen, from Old English byrelian (“to give or serve a drink to”), from byrele (“cup-bearer, steward, butler”), from Proto-Germanic *burilijaz (“carrier, manservant”), from *burjô (“descendant, son”), from Proto-Germanic *beraną (“to bear, carry”), from Proto-Indo-European *bʰer-, *bʰrē- (“to bear”). Related to Old English byre (“son, offspring, youth”). More at bear.
Alternative forms 
birle (third-person singular simple present birles, present participle birling, simple past and past participle birled)
- to pour a drink (for).
- c.1882-1898, Francis James Child (collector and editor), Child's Ballads, Number 68: "Young Hunting",
- She has birld in him Young Hunting / The good ale and the beer, / Till he was as fou drunken / As any wild-wood steer.
- to drink deeply or excessively, carouse.
- c.1882-1898, Francis James Child (collector and editor), Child's Ballads, Number 73: "Lord Thomas and Fair Annet",
- They birled, they birled at Annies wake / The white bread and the wine, / And ere the morn at that same time / At his they birled the same.
birle (infinitive birlar)
- First-person singular (yo) present subjunctive form of birlar.
- Third-person singular (él, ella, also used with usted?) present subjunctive form of birlar.
- Formal second-person singular (usted) imperative form of birlar.