The two crossword solutions for the term 'attention-grabbing sound' are 'psst' and 'ahem'. 'Psst' is a sound made by whispering or hissing, usually to get someone's attention without alerting others. It is often used to indicate secrecy or confidentiality. 'Ahem' is a sound made by clearing one's throat, usually to get someone's attention. It is often used to indicate disapproval or to politely interrupt someone. Both of these sounds are used to grab someone's attention in a subtle way.