Wiktionary
best efforts
alt. 1 (context legal English) An assurance of good-faith effort to achieve best results under prevailing circumstances. 2 (context finance English) An effort to sell securities without a firm underwriting. n. 1 (context legal English) An assurance of good-faith effort to achieve best results under prevailing circumstances. 2 (context finance English) An effort to sell securities without a firm underwriting.
Usage examples of "best efforts".
And how does it know that Seth hasn't seen this final card, as he has seen some of the others Tak has held, even in spite of its best efforts to hide them?