• By (herself)
• By (myself)
• By (someone's) reckoning
• By (themselves)
• By a fluke
• By a long chalk
• By a narrow margin
• By a whisker
• By accident
• By all accounts
• By all means
• By chance
• By cockcrow
• By coincidence
• By convention
• By definition
• By degrees
• By design
• By dint effort
• By golly