動詞 frequent:

1. do one's shopping at; do business with; be a customer or client of
   同義詞：patronize, patronise, shop, shop at, buy at, sponsor
2. be a regular or frequent visitor to a certain place
   同義詞：haunt

形容詞 frequent:

1. coming at short intervals or habitually
2. frequently encountered;

1. His frequent hesitations annoyed the audience.
   他三番五次欲言又止，聽眾已感到厭煩。
2. He suffers from frequent bouts of depression.
   他患多發(fā)性抑郁癥。
3. The factory is in frequent scarcity of raw materials.
   這個工廠經(jīng)常原料不足。
4. Production in the factories stopped because of frequent power failures.
   頻繁的停電使工廠停產(chǎn)。
5. These woods are frequented by all kinds of birds.
   這些樹林里經(jīng)常棲息著各種鳥類。
6. The police visited all the bars that the suspect frequented.
   警察調(diào)查了嫌疑犯時常出沒的所有酒吧。
7. He is a frequent visitor to our house.
   他是我們家的常客。

fre.quent

adj.（形容詞）
Occurring or appearing quite often or at close intervals:
經(jīng)常的：時常或間歇很短的發(fā)生或出現(xiàn)：
例句：
frequent errors of judgment.
判斷中經(jīng)常出現(xiàn)的錯誤

v.tr.（及物動詞）
fre.quent.ed,fre.quent.ing,fre.quents也作 [frô-kwμnt.]
To pay frequent visits to; be in or at often:
時常出入：頻繁的訪問；經(jīng)常在那兒或常常出現(xiàn)：
例句：
frequent a restaurant.
常去的飯館

來源：
Middle English [ample, profuse]
中古英語 [豐富的，頻繁的]
from Old French
源自 古法語
from Latin frequôns frequent- [crowded, numerous, frequent]
源自 拉丁語 frequôns frequent- [擁擠的，無數(shù)的，擠滿的]

【引伸】
fre.quenta.tion
n.（名詞）
frequent.er
fre.quentness
n.（名詞）