Dic: weigh as consider

• He is weighing the possibility of filing criminal charges against the doctor.
• She spoke very slowly, weighing what she would say.
• The company will be able to weigh up the environmental pros and cons of each site.

3. VERB | If you weigh the facts about a situation, you consider them very carefully before you make a decision, especially by comparing the various facts involved.(= consider) Weigh up means the same as weigh(PHRASAL VERB).

... Cobuild (네이버)

CF. Dic: weigh in

CF. WordNet

1. (hash out)  to think about carefully ㅡ Synonyms: consider, debate, deliberate, moot, turn over. Type of: hash out. Similar to: study
3. (show consideration for)  to show consideration for; to take into account ㅡ Synonyms: consider, count.

... http://www.memidex.com/weigh

CF. The American Heritage

3(a). To balance in the mind in order to make a choice; ponder or evaluate: weighed the alternatives and decided to stay.
3(b). To choose carefully or deliberately: weigh one's words.

... http://www.thefreedictionary.com/weigh