The antonyms for the word "frowns up on" are numerous and include words such as accept, approve, endorse, encourage, support, welcome, or embrace. These terms all suggest a positive and open attitude towards something, in contrast to the negative and rejecting connotations of "frown upon." For example, a company may frown upon employees taking breaks, but if they embrace the importance of mental health breaks, they will actively encourage them. A society may frown upon same-sex relationships, but if it endorses and supports them, it creates an inclusive and accepting environment. Therefore, it is essential to consider the opposite meaning of words and choose our language wisely to promote positivity and harmony.