Definition of the word brick in

The expression "brick in" originated in the mid-1800s in the context of building construction. It describes the process of placing a brick into mortar to form part of a wall structure. The phrase "brick in" was used as a shorthand way for builders and bricklayers to communicate the instruction to others on the construction site. In its most basic form, "brick in" is a simple method of specifying where and how a brick should be inserted into a wall. This construction method has been used for centuries and has become a commonly understood term in the building industry, both as a verb ("I'll brick this in now") and a noun ("We have 50 bricks left to brick in"). Although its origins are rooted in building, the term "brick in" has now become a metaphorical expression in modern-day language to describe the act of adding something as a permanent or integral part of a system or process. In this sense, the verb "brick in" is sometimes used figuratively in relation to instructions, rules, or information that cannot be easily removed or modified once implemented.