by chance (o) (possibility) | por acaso (o) (possibility) |
by chance (o) (general) | inesperadamente (o) (general) |
by chance (o) (general) | acidentalmente (o) (general) |
by chance (o) (general) | desavisadamente (o) (general) |
by chance (o) (general) | por acaso (o) (general) |