Denshi Jisho — Online Japanese dictionary

睨む にらむ 1: to glare at; to scowl at; to glower at;
2: to stare intensely at; to examine carefully;
3: to estimate; to guess; to suspect; to judge;
4: to keep an eye on someone (e.g. a suspicious or untrustworthy person); to watch;
5: to take account of; to take into consideration
Common word, Godan verb with mu ending, Transitive verb 

You can also

Look up kanji details for 睨む.

Try a Yahoo Jisho search for 睨む .
Try a Goo Jisho search for 睨む .
Try a Google search for 睨む .