Dictionary

by Allah en · ADV

From Arabic الله (allāh, “the deity, God”). Compare by God.

(not-comparable) An oath to emphasize sincerity or truthfulness, by God
- O community of Muhammad! By Allah, if you knew what I knew, you would laugh little and weep much. 1989, Malik ibn Anas, translated by Aisha Abdurrahman Bewley, Al-Muwatta of Imam Malik ibn Anas:
- The eldest, however, having hent in hand a bannock of bread, exclaimed, “By Allah, verily this cake was baked by a woman in her ailment!” 1885, Richard F. Burton, “Story of the Sultan of Al-Yamman and his three sons”, in A Plain and Literal Translation of the Arabian Nights Entertainments, volume III, page 357:
(not-comparable) Very, truly, indeed.
- ‘Was not the best food to him camel meat and the best drink camel milk[?]’ They said, ‘Yes, by Allah.’ 2007, Muhammad Saed Abdul-Rahman, The Meaning and Explanation of the Glorious Qur'an, page 7:

very (very, truly)

From Arabic الله (allāh, “the deity, God”). Compare by God.

An exclamation of surprise or excitement, oh my God! good Lord!
- “Oh!” said the King, “by Allah! but vengeance is an inspiriting pleasure!” 1878, Mariana Monteiro, Allah-Akbar. God is Great, page 101: