batir el hierro cuando está al rojo angolul

strike while the iron is hot▼(act on an opportunity promptly)
verb
[UK: straɪk waɪl ðə ˈaɪən ɪz hɒt] [US: ˈstraɪk ˈwaɪl ðə ˈaɪərn ˈɪz hɑːt]