The crossword solutions for the term 'AT 'EM!' are 'LEMME' and 'UPAND'. 'Lemme' is an informal contraction of 'let me', which is used to request permission to do something. 'Upand' is a dialectal variant of 'UPON', which is used to indicate that something is happening or has happened. Together, these two words form the phrase 'Let me up and AT 'EM!', which is an expression of enthusiasm and determination to take action.